If we do not used them within 2 weeks of purchase, onions and garlic germinate and rot. I often put them in compost!
This is because I did not know yet this trick that keeps onions and garlic fresh for months!
What's this life hack? You just have to keep them in a brown paper bag with holes like this!

Make several holes with a hole punch. Fold the bags in 2 or 4 to punch several holes at the same time.

Fill the bags only half-way with onions or garlic, fold the top of the bag and close it with a clip for chips' bag.
Store the bags in a cool and dark place, let the air circulate well.
Here's what the onions look like after 3 months in a brown paper bag with holes! Always fresh and clean!

This is a great trick for single people who take time to eat onions and garlic, or enjoy special offer for a large amount of onions!
It is also great for the chalet we only visit few times a year!
Source: Comment économiser · Photo Credit: Comment économiser